Calcite

Stank Mine, Barrow-in-Furness, former Cumberland, Cumbria  United Kingdom

Specimen size: 6.8 × 4.4 × 3.4 cm = 2.68” × 1.73” × 1.34”
Main crystal size: 2.2 × 0.8 cm = 0.87” × 0.31”